<?php declare(strict_types=1);
/*
 * This file is part of PHPUnit.
 *
 * (c) Sebastian Bergmann <sebastian@phpunit.de>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace PHPUnit\Runner;

use const PHP_EOL;
use function getmypid;
use function register_shutdown_function;
use function rtrim;

/**
 * @no-named-arguments Parameter names are not covered by the backward compatibility promise for PHPUnit
 *
 * @internal This class is not covered by the backward compatibility promise for PHPUnit
 */
final class ShutdownHandler
{
    private static bool $registered = false;
    private static string $message  = '';

    public static function setMessage(string $message): void
    {
        self::register();

        self::$message = $message;
    }

    public static function resetMessage(): void
    {
        self::$message = '';
    }

    private static function register(): void
    {
        if (self::$registered) {
            return;
        }

        self::$registered = true;
        $pid              = getmypid();

        register_shutdown_function(
            static function () use ($pid): void
            {
                $message = rtrim(self::$message);

                if ($message === '' || $pid !== getmypid()) {
                    return;
                }

                print $message . PHP_EOL;
            },
        );
    }
}
